1. User looked at a coadd image, select a point on it,  then she wants to extract the photometry at that point from all the PVIs used to make that coadd image. 
  2. After getting all the PVIs, user wants to tweak some parameters and remake the coadd image, saving it in the workspace
  3. User got a list of objects, select one object, wants to get all the provenance data that pipeline used to produce that object, including the PVIs, coadd image, calibration files ...

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